CN1116241A - Producing technology of low hydrogen high nitrogen steel - Google Patents
Producing technology of low hydrogen high nitrogen steel Download PDFInfo
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- CN1116241A CN1116241A CN 94112249 CN94112249A CN1116241A CN 1116241 A CN1116241 A CN 1116241A CN 94112249 CN94112249 CN 94112249 CN 94112249 A CN94112249 A CN 94112249A CN 1116241 A CN1116241 A CN 1116241A
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Abstract
Said technology is that the bottom blowing nitrogen is adopted in whole smelting process, nitrogen alloy is added to molten steel at tapping, nitrogen is used as circular flow gas in RH treatment. By said method can be smelt the low hydrogen high nitrogen steel of H] less than 2 ppm, T O] less than 40ppm, S] less than 100 ppm, and N] (100-180) ppm.
Description
The production method that belongs to high nitrogen steel.
Produce high nitrogen steel, usually adopt and add the nitrogen alloy in the ladle molten steel or the method for nitrogen blowing in the ladle molten steel, as clear 61-91317 under non-oxidizing atmosphere, nitrogen blowing is in the ladle molten steel from spray gun, in the hope of the nitrogen content that obtains to set, but its shortcoming is to be blown into nitrogen in the ladle molten steel, it is fierce to cause molten steel to stir, and the molten steel temperature drop is big.And the recovery rate of nitrogen is also unstable, if require [H]≤2PPm in the steel, (≤2 * 133.3Pa) handle, and the nitrogen that then dissolves in the molten steel can be by a large amount of eliminatings, and nitrogen in steel content more is difficult to guarantee that low hydrogen and high nitrogen-containing can not get both simultaneously in the steel through condition of high vacuum degree with regard to needing.
For overcoming above-mentioned shortcoming.Invented a kind of production method that can under condition of high vacuum degree, produce low hydrogen high nitrogen steel.
The production technique of low hydrogen high nitrogen steel of the present invention comprises:
1. bessemerizing whole process, adopting bottom blowing nitrogen, nitrogen flushing tolerance is 600m
3/ h bessemerizes terminal point [N] and improves 10～20PPm than BOTTOM ARGON BLOWING, is equivalent to add the nitrogen pick-up effect of nitrogen alloy 300～500Kg, and can saves argon gas 100～150m
3/ ch.
2. in the ladle molten steel, add the nitrogen pick-up of nitrogen alloy at tapping process, go out to ladle three/for the moment at molten steel, the nitrogen alloy by the furnace top bin weighing after alloy chute add in the ladle, or behind stove, load weighted nitrogen alloy given and add the drop-bottom middle hopper earlier, opening valve adds in the ladle, the kind that adds the nitrogen alloy is decided according to the needs of elemental composition in the steel, the add-on of nitrogen alloy is pressed the finished product target nitrogen of steel and is decided, what add usually has nitrogenized manganese, a chromium nitride, the recovery rate of nitrogen is more stable behind the nitrogen alloy adding ladle molten steel, sees Fig. 1.
3.RH nitrogen is protected in the dehydrogenation of this processing azo-cycle stream, in this treating processes of RH, vacuum tightness is transferred to≤(1～2) * 133.3Pa, and replaces argon gas as recycle stream with nitrogen, the nitrogen circulation is 1000～1500l/h.General low hydrogen, low-sulfur steel be through this processing of RH argon gas circulation, treatment time 〉=24min, but the molten steel denitrification percent is up to more than 60%.Adopt nitrogen circulation through this processing of RH, the molten steel denitrification percent can reduce to 17～30%.In this treating processes of RH in argon circulation and the azo-cycle stream steel [N] change and to see Fig. 2.
4.RH light the processing transferred nitrogen.Finish preceding 3～5 minutes in this processing of RH, vacuum tightness is transferred to 〉=(10-30) * 133.3Pa, be beneficial to add the nitrogen alloy nitrogen fuse into molten steel, the light processing of RH still made recycle stream with nitrogen, by the RH furnace top bin nitrogen alloy is added in the molten steel, the fine setting nitrogen in steel, the recovery rate of nitrogen brings up to 30%, and very stable, the light processing of RH adds nitrogen alloy fine setting [N] recovery rate and sees Fig. 3.
Adopt present method, molten steel can reach low hydrogen [H]≤2PPm, hypoxemia T[O through the RH vacuum-treat]≤40PPm, low-sulfur [S]≤100PPm and high nitrogen [N] 100～180PPm.
Embodiment 1:
At 300t oxygen top and bottom combined blown converter smelting casing steel, (target [N] (140-180) PPm, [H]≤2PPm, [O]≤30PPm, [C]≤0.30～0.34%, [S]≤100PPm).
Bottom blowing nitrogen in the whole process of bessemerizing, nitrogen flushing tolerance 719m3/h, during blow end point in the steel [N] be 40PPm, when tapping to ladle 1/3rd positions, the 2000Kg chromium nitride is added in the ladle molten steel through the alloy chute by middle hopper behind the stove, the molten steel sampling analysis, [N] is 160PPm, this treating processes of RH vacuum tightness＜2 * 133.3Pa, the nitrogen circulation is 12001/h, it is 98PPm that RH analyzes [N] when handling to 23 minutes, and vacuum tightness is transferred to 30 * 133.3Pa, by furnace top bin the 800Kg chromium nitride is added in the molten steel.
Finished product [N] is 156PPm, and [H] is 1.4PPm, and T [O] is 17PPm, and [S] is 76PPm, and [C] is 0.334%.
The composition target value and the actual value of casing steel are listed in table 1.
Embodiment 2:
At 300t oxygen top and bottom combined blown converter smelting spherical tank steel, (target [N] 100～150PPm, [H]≤2.5PPm, [O]≤40PPm, [C]≤0.095～0.134%, [S]≤50PPm).
Bottom blowing nitrogen in the whole process of bessemerizing, nitrogen flushing tolerance 600m
3/ h, [N] is 18PPm in the blow end point steel, when tapping to ladle 1/3rd positions, 900Kg chromium nitride, 1000Kg nitrogenized manganese added in the molten steel through the alloy chute by middle hopper behind the stove, molten steel sampling analysis [N] is 163PPm, RH treating processes, vacuum tightness are 133.3Pa, and the nitrogen circulation is 1400l/h, sampling analysis before the RH processing finishes, [N] is 92PPm, vacuum tightness transferred cause 20 * 133.3Pa, by furnace top bin the 550Kg nitrogenized manganese added in the molten steel.
Finished product [N] 133PPm, [H] 1.7PPm, T[O] 38PPm, [C] 0.111%, [S] 36PPm,
The composition target value and the actual value of spherical tank steel are listed table 1 in.Table 1.
| Element in the steel | Casing steel | The spherical tank steel | ||
| Target value | Actual value | Target value | Actual value | |
| ????C | ?0.30～0.34 | ?0.334％ | ??0.095～0.134％ | ?0.111％ |
| ????H | ???≤2PPm | ?1.5PPm | ?????≤2.5PPm | ?1.7PPm |
| ????O | ???≤30PPm | ?14PPm | ?????≤40PPm | ?38PPm |
| ????N | ?140～180PPm | ?145PPm | ??100～150PPm | ?133PPm |
| ????S | ???≤100PPm | ?76PPm | ?????≤50PPm | ?36PPm |
Claims (3)
1. the production technique of low hydrogen high nitrogen steel, nitrogen blowing is in the ladle molten steel from spray gun, with the nitrogen content that obtains to set, the invention is characterized in, adopt bottom blowing nitrogen in the whole process of bessemerizing, tapping process adds the nitrogen pick-up of nitrogen alloy in the ladle molten steel, make recycle stream with nitrogen and protect nitrogen in this treating processes of RH, gently handles at RH to add nitrogen alloy fine setting nitrogen.
2. the production technique of low hydrogen high nitrogen steel according to claim 1 is characterized in that, this treating processes of RH is made recycle stream with nitrogen, and the vacuum tightness that RH is handled is adjusted to (1～2) * 133.3Pa.
3. the production technique of low hydrogen high nitrogen steel according to claim 1 is characterized in that, gently handles at RH, nitrogen circulation, add the nitrogen alloy and transfer nitrogen, the vacuum tightness that RH is handled is adjusted to (10～30) * 133.3Pa, the nitrogen from RH furnace top bin adding nitrogen alloy fine setting steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94112249A CN1038347C (en) | 1994-08-03 | 1994-08-03 | Producing technology of low hydrogen high nitrogen steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94112249A CN1038347C (en) | 1994-08-03 | 1994-08-03 | Producing technology of low hydrogen high nitrogen steel |
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| Publication Number | Publication Date |
|---|---|
| CN1116241A true CN1116241A (en) | 1996-02-07 |
| CN1038347C CN1038347C (en) | 1998-05-13 |
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| CN94112249A Expired - Fee Related CN1038347C (en) | 1994-08-03 | 1994-08-03 | Producing technology of low hydrogen high nitrogen steel |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318612C (en) * | 2000-12-13 | 2007-05-30 | 杰富意钢铁株式会社 | Process for producing high-nitrogen ultra low-carbon steel |
| CN100513019C (en) * | 2007-09-06 | 2009-07-15 | 安泰科技股份有限公司 | Method for producing stainless steel powder containing nitrogen high nitrogen by adopting gas atomization method |
| CN101168817B (en) * | 2006-10-25 | 2010-10-13 | 宝山钢铁股份有限公司 | Method for increasing nitrogen content of nitrogen-containing clean steel |
| CN102296160A (en) * | 2011-08-16 | 2011-12-28 | 秦皇岛首秦金属材料有限公司 | Low-cost RH molten steel nitrogen increasing and controlling process |
| CN102399945A (en) * | 2010-09-08 | 2012-04-04 | 鞍钢股份有限公司 | Method for producing non-quenched and tempered N80 petroleum pipe by RH refining process |
| CN102634643A (en) * | 2012-04-10 | 2012-08-15 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling nitrogen content of high-permeability-grade oriented electrical steel belt |
| CN102851455A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Method for producing high-nitrogen IF steel |
| CN102925618A (en) * | 2012-10-23 | 2013-02-13 | 鞍钢股份有限公司 | Nitrogen increasing method for vanadium and nitrogen-containing microalloyed steel |
| CN103710486A (en) * | 2013-12-20 | 2014-04-09 | 鞍钢股份有限公司 | Method for increasing nitrogen content of steel |
| CN104087705A (en) * | 2014-07-23 | 2014-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for controlling nitrogen content of high-nitrogen steel |
| CN105154628A (en) * | 2015-10-21 | 2015-12-16 | 广东韶钢松山股份有限公司 | RH dehydrogenation and nitrogen addition process for nitrogen-containing steel |
| CN105950971A (en) * | 2016-05-12 | 2016-09-21 | 武汉钢铁股份有限公司 | Engineering machinery steel with yield strength being larger than or equal to 960 MPa grade and production method |
| CN106755730A (en) * | 2016-12-22 | 2017-05-31 | 北京首钢股份有限公司 | A kind of method of nitrogen content in control high nitrogen steel |
| CN110607413A (en) * | 2019-11-01 | 2019-12-24 | 武汉钢铁集团鄂城钢铁有限责任公司 | Smelting method of low-cost high-nitrogen steel |
| CN112322843A (en) * | 2020-11-20 | 2021-02-05 | 青岛特殊钢铁有限公司 | RH nitrogen increasing method suitable for steel grade with higher nitrogen content |
| CN113774188A (en) * | 2021-07-23 | 2021-12-10 | 广西富川正辉机械有限公司 | Premelted refining slag, preparation method and application of premelted refining slag in refining of high-purity manganese 25 ultrahigh-manganese steel material |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4081270A (en) * | 1977-04-11 | 1978-03-28 | Union Carbide Corporation | Renitrogenation of basic-oxygen steels during decarburization |
-
1994
- 1994-08-03 CN CN94112249A patent/CN1038347C/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318612C (en) * | 2000-12-13 | 2007-05-30 | 杰富意钢铁株式会社 | Process for producing high-nitrogen ultra low-carbon steel |
| CN101168817B (en) * | 2006-10-25 | 2010-10-13 | 宝山钢铁股份有限公司 | Method for increasing nitrogen content of nitrogen-containing clean steel |
| CN100513019C (en) * | 2007-09-06 | 2009-07-15 | 安泰科技股份有限公司 | Method for producing stainless steel powder containing nitrogen high nitrogen by adopting gas atomization method |
| CN102399945B (en) * | 2010-09-08 | 2013-07-31 | 鞍钢股份有限公司 | Method for producing non-quenched and tempered N80 petroleum pipe by RH refining process |
| CN102399945A (en) * | 2010-09-08 | 2012-04-04 | 鞍钢股份有限公司 | Method for producing non-quenched and tempered N80 petroleum pipe by RH refining process |
| CN102851455A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Method for producing high-nitrogen IF steel |
| CN102296160A (en) * | 2011-08-16 | 2011-12-28 | 秦皇岛首秦金属材料有限公司 | Low-cost RH molten steel nitrogen increasing and controlling process |
| CN102634643A (en) * | 2012-04-10 | 2012-08-15 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling nitrogen content of high-permeability-grade oriented electrical steel belt |
| CN102634643B (en) * | 2012-04-10 | 2013-08-14 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling nitrogen content of high-permeability-grade oriented electrical steel belt |
| CN102925618A (en) * | 2012-10-23 | 2013-02-13 | 鞍钢股份有限公司 | Nitrogen increasing method for vanadium and nitrogen-containing microalloyed steel |
| CN103710486A (en) * | 2013-12-20 | 2014-04-09 | 鞍钢股份有限公司 | Method for increasing nitrogen content of steel |
| CN104087705A (en) * | 2014-07-23 | 2014-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for controlling nitrogen content of high-nitrogen steel |
| CN105154628A (en) * | 2015-10-21 | 2015-12-16 | 广东韶钢松山股份有限公司 | RH dehydrogenation and nitrogen addition process for nitrogen-containing steel |
| CN105950971A (en) * | 2016-05-12 | 2016-09-21 | 武汉钢铁股份有限公司 | Engineering machinery steel with yield strength being larger than or equal to 960 MPa grade and production method |
| CN106755730A (en) * | 2016-12-22 | 2017-05-31 | 北京首钢股份有限公司 | A kind of method of nitrogen content in control high nitrogen steel |
| CN110607413A (en) * | 2019-11-01 | 2019-12-24 | 武汉钢铁集团鄂城钢铁有限责任公司 | Smelting method of low-cost high-nitrogen steel |
| CN112322843A (en) * | 2020-11-20 | 2021-02-05 | 青岛特殊钢铁有限公司 | RH nitrogen increasing method suitable for steel grade with higher nitrogen content |
| CN113774188A (en) * | 2021-07-23 | 2021-12-10 | 广西富川正辉机械有限公司 | Premelted refining slag, preparation method and application of premelted refining slag in refining of high-purity manganese 25 ultrahigh-manganese steel material |
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| Publication number | Publication date |
|---|---|
| CN1038347C (en) | 1998-05-13 |
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Granted publication date: 19980513 |